Abdominal exerciser



FIG. 1 is a top plan view of an abdominal exerciser showing my newdesign, wherein the bottom plan view is a mirror image thereof;

FIG. 2 is a perspective view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a rear elevational view thereof.

The ornamental design for an abdominal exerciser, as shown anddescribed.